bike recognition problem already solved
Since the thread has lately been sidelined about taxis, I should note that in many parts of (possibly most) states, ther are forty mile gaps between taxis. No mass transit. AND.... half of american drivers would give up their guns before giving up their POV cars.
Anyway the issue of a free app or tiny signal devices to bikes (or other hard to recognize things in traffic) which send or receive an identity signal for autodrive cars to read and recognize already exists. The electric and water companies use something like that to "drive by" read meters already. Keeps it simpler than trying to make a car do all the work. Just a reflector mounted signal that when read by the car says "I am a bike" or "blind pedestrian" or "loose dog with a collar".